Crank-shaft for engines.



No.- 745,700. PATENTED DEG. 1, 1903.

R. B. WEAVER. CRANK SHAFT FOR ENGINES.

APPLIUATION FILED JULY 8. 1903.

N0 MODEL.

Mll/m m w 9 .a

UNITED STATES Patented December 1, 1903.

PATENT Ormes.

RALPH B. WEAVER, OF MILTON, MASSACHUSETTS, ASSIGNOR TO SAMUEL OABOT, yOF BOSTON, MASSACHUSETTS.

cRANK-SHAFT roul ENGINES.

SPECIFICATION formingpart of Letters Patent No. 745,700, dated December 1, 1903. Application `tiled July 8, 1903x Serial No. 164,679. (No model.)

To @Z5 Vwhom, it may concern:

Be it known that I, RALPH B NVEAVER, of Milton, in the 'county of Norfolk and State of Massachusetts, have iuventedcertain new and useful Improvements in Crank-Shafts for Engines, of which the following is a specification, reference 'being had therein to the accompanying drawings.

This invention has reference to improvements in crank-shafts for engines and in the connection therewith of the piston-rod. v One object of the invention is to facilitate the assembling of the crank-shaft with the bearings in which it is journaled and with the piston-rod.

Another object of the invention is to so construct a crank-shaft that a solid bearingsleeve for the piston-rod may be utilized.

Another' object of the invention is to improve the general construction of crankshafts and their associated parts.

The invention consists in the peculiar features of construction and combination of parts whereby the objects of the invention are eected, as will hereinafter be more fully described, and pointed out in the claim.

Figure 1 represents a sectionalview of portions of an engine, illustrating this invention. Fig. 2 represents a sectional view of the same, taken at right angles to Fig. 1. Fig. 3 represents a detail view of portions'of the crankshaft. Y.

Similar numbers of reference designate cor- Y Y lOnofastening for the parts of the crank is responding parts throughout.

In engines, and particularly in gas-engines, it is important to reduce the number of parts which are secured together with bolts, owing to the constant attention required to tighten the same in order to prevent the damage occurring from a loosened part and to maintain. the parts in accurate operative relation. Y It is also essential to the assembling of the parts, especially in small engines having contracted crank-boxes, that the crank-shaft should be associated with the piston-rod and the bearings in which the crank-shaft works without the subsequent adjustment of nuts of bolts within the contracted limits of the crankbox, and at the same time facilitate the assembling of these parts.

In the drawings, 5 indicates the crank-box,

having the closed sides 6 6 and the ends 7 7 furnished with the openingsS 8. To these Yends 7 7 are secured-Vin any suitable manner `the closures or plates 9 9, having or provided with the shaft-bearingsr'lO 10, preferablysupplied with the sleeves 11 11.

The crank-shaft is divided into two parts, each of which is journaled in its related bearing 10. The part 12 has the'crank-arm 13, on which is mounted the pin 14, having the end 15 reduced in diameter from that of the main portion of the pin, the part 16 having the arm 17 furnished with the socket-pin 18, shaped to receive the pin 14E of the shaft member 12 with a'close sliding fit.

The piston 19 may be connected with its rod 2O in any suitable manner. This connection is not shown herein, as it forms no part of thepresent invention, and at one end of the piston-rod is the annular solid strap or bearing 21, designed to closely embrace the socket-pin 18 to permit of the rotation of said pin therein.

The parts may readily be assembled by positioningthe strap 21 opposite one of the openings 8 8 and inserting in the strap the socketpin 18, then inserting the arm 13, with its pin '14, through the other of the openings 8,

and. seating the pin 14 in the socket of the ,pin 18, the plates 9 9 being then bolted or otherwise secured tothe ends 7 7 of the crankbox.V

Owing to the alinement of the bearings 10 necessarynand the spreading of the arms 13 and 17 is prevented by the plates 9 9, while the strength of the connection formed by the pins 14 and 1S between the arms 13 and 17 and the strap 21 is equal to that of a solid pin.

By ,the use of this two-part crank the lstrap 21 is preferably continuous without fastening :devices or adjustment screwsor bolts of any IDO guiding of the loosened nuts or bolts between the parts of thecrank and piston and the Walls of the crank-box. This peculiar construction of the two-part crank-pin also permits of a certain degree of iiexibility in the action of the crank, which is of some importance in that class of engines used in motor vehicles and launches, the repair of engines of this character being also facilitated by this construction.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combination with the box 5 having the ends 7 7 furnished with the openings 8 8, and the plates 9 9 adapted to close said openings RALPH B. WEAVER.

Witnesses:-

HENRY J. MILLER, C. A. LISET. 

